So I thought it may be useful to start a list of devices that people have had this issues with.
So far I've heard that aqualifters sometimes stay on.
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There is no definitive list. The fact is some items work for one customer and not another. That is the primary reason for having channels 1 and 4 as relays.
I have read the manual and I can not solve my problem. Everytime I enter standby mode and come back some of my lights on my PC4 start flashing.